The Liber de secretis naturae seu de quinta essentia is the central work in the Pseudo-Lullian Alchemical corpus, a large collection of as many as 143 different texts that circulated as the work of Raymond Lull (Ramon Llull or Raimundus Lullus; 1232-1316), the famous Catalan philosopher, theologian, and mystic. Notably, the author of this work used large sections of an earlier work by John of Rupescissa (c. 1310-c. 1362), De consideratione quintae essentiae omnium rerum, which links alchemy with medicine by describing the process of producing aqua vitae (Latin for "water of life") by the distillation of wine; per Rupescissa, the resulting substance could prevent corruption and decay, and thus prevent illness and premature aging. The Liber de secretis naturae, in contrast with Rupescissa’s text, is not primarily interested in the medical application of the quintessence, but instead interprets these ideas as part of an alchemical system that includes medicine, the transmutation of metals, and the artificial production of precious stones.
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Miscellany of Medical, Magical, and Alchemical RecipesCirca 1520 – 1540